EDGE® 黃銅氣體透鏡適配器 含O形環，適用於9 & 20石英杯

The o-rings came pre-installed, which saved me the fiddly work of seating them myself. Fits both my 9 and 20 quartz cups without any wobble, and the brass threads feel solid when I tighten it down.

The brass threads bit in perfectly on my 9 series torch, and having the o-rings already seated saved me from hunting down tiny parts. The fit on the quartz cup is snug with zero wobble, exactly what I needed for a clean seal.

Installed it on my 20 series torch and the brass threading fit perfectly snug, no wobble at all. The o-rings were already in place so I didn’t have to fiddle with them, which saved me a few minutes.